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Commit 88b0ddf6 authored by Chao Yu's avatar Chao Yu Committed by Sahitya Tummala
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f2fs: submit cached bio to avoid endless PageWriteback 



When migrating encrypted block from background GC thread, we only add
them into f2fs inner bio cache, but forget to submit the cached bio, it
may cause potential deadlock when we are waiting page writebacked, fix
it.

Change-Id: I3e0f31c8825e5d7a33bad296562a2a652236f5ef
Signed-off-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
Git-commit: 1b456ddbaa5457c807f7315d5e0f1188c88a6ddc
Git-repo: https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git/


[stummala@codeaurora.org: Back port the change]
Signed-off-by: default avatarSahitya Tummala <stummala@codeaurora.org>
parent 93449487

fs/f2fs/f2fs.h

+1 −1
Original line number Diff line number Diff line
@@ -2733,7 +2733,7 @@ struct page *new_node_page(struct dnode_of_data *dn, unsigned int ofs); 
void ra_node_page(struct f2fs_sb_info *sbi, nid_t nid);

struct page *get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid);

struct page *get_node_page_ra(struct page *parent, int start);

void move_node_page(struct page *node_page, int gc_type);

int move_node_page(struct page *node_page, int gc_type);

int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,

			struct writeback_control *wbc, bool atomic);

int sync_node_pages(struct f2fs_sb_info *sbi, struct writeback_control *wbc,

fs/f2fs/gc.c

+52 −22
Original line number Diff line number Diff line
@@ -477,13 +477,14 @@ static int check_valid_map(struct f2fs_sb_info *sbi, 
 * On validity, copy that node with cold status, otherwise (invalid node)

 * ignore that.

 */

static void gc_node_segment(struct f2fs_sb_info *sbi,

static int gc_node_segment(struct f2fs_sb_info *sbi,

		struct f2fs_summary *sum, unsigned int segno, int gc_type)

{

	struct f2fs_summary *entry;

	block_t start_addr;

	int off;

	int phase = 0;

	int submitted = 0;



	start_addr = START_BLOCK(sbi, segno);
@@ -494,10 +495,11 @@ static void gc_node_segment(struct f2fs_sb_info *sbi, 
		nid_t nid = le32_to_cpu(entry->nid);

		struct page *node_page;

		struct node_info ni;

		int err;



		/* stop BG_GC if there is not enough free sections. */

		if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0))

			return;

			return submitted;



		if (check_valid_map(sbi, segno, off) == 0)

			continue;
@@ -530,12 +532,15 @@ static void gc_node_segment(struct f2fs_sb_info *sbi, 
			continue;

		}



		move_node_page(node_page, gc_type);

		err = move_node_page(node_page, gc_type);

		if (!err && gc_type == FG_GC)

			submitted++;

		stat_inc_node_blk_count(sbi, 1, gc_type);

	}



	if (++phase < 3)

		goto next_step;

	return submitted;

}



/*
@@ -602,7 +607,7 @@ static bool is_alive(struct f2fs_sb_info *sbi, struct f2fs_summary *sum, 
 * Move data block via META_MAPPING while keeping locked data page.

 * This can be used to move blocks, aka LBAs, directly on disk.

 */

static void move_data_block(struct inode *inode, block_t bidx,

static int move_data_block(struct inode *inode, block_t bidx,

					unsigned int segno, int off)

{

	struct f2fs_io_info fio = {
@@ -620,21 +625,26 @@ static void move_data_block(struct inode *inode, block_t bidx, 
	struct node_info ni;

	struct page *page;

	block_t newaddr;

	int err;

	int err = 0;



	/* do not read out */

	page = f2fs_grab_cache_page(inode->i_mapping, bidx, false);

	if (!page)

		return;

		return -ENOMEM;



	if (!check_valid_map(F2FS_I_SB(inode), segno, off))

	if (!check_valid_map(F2FS_I_SB(inode), segno, off)) {

		err = -ENOENT;

		goto out;

	}



	if (f2fs_is_atomic_file(inode))

	if (f2fs_is_atomic_file(inode)) {

		err = -EAGAIN;

		goto out;

	}



	if (f2fs_is_pinned_file(inode)) {

		f2fs_pin_file_control(inode, true);

		err = -EAGAIN;

		goto out;

	}
@@ -645,6 +655,7 @@ static void move_data_block(struct inode *inode, block_t bidx, 


	if (unlikely(dn.data_blkaddr == NULL_ADDR)) {

		ClearPageUptodate(page);

		err = -ENOENT;

		goto put_out;

	}
@@ -724,31 +735,40 @@ static void move_data_block(struct inode *inode, block_t bidx, 
	f2fs_put_dnode(&dn);

out:

	f2fs_put_page(page, 1);

	return err;

}



static void move_data_page(struct inode *inode, block_t bidx, int gc_type,

static int move_data_page(struct inode *inode, block_t bidx, int gc_type,

							unsigned int segno, int off)

{

	struct page *page;

	int err = 0;



	page = get_lock_data_page(inode, bidx, true);

	if (IS_ERR(page))

		return;

		return PTR_ERR(page);



	if (!check_valid_map(F2FS_I_SB(inode), segno, off))

	if (!check_valid_map(F2FS_I_SB(inode), segno, off)) {

		err = -ENOENT;

		goto out;

	}



	if (f2fs_is_atomic_file(inode))

	if (f2fs_is_atomic_file(inode)) {

		err = -EAGAIN;

		goto out;

	}

	if (f2fs_is_pinned_file(inode)) {

		if (gc_type == FG_GC)

			f2fs_pin_file_control(inode, true);

		err = -EAGAIN;

		goto out;

	}



	if (gc_type == BG_GC) {

		if (PageWriteback(page))

		if (PageWriteback(page)) {

			err = -EAGAIN;

			goto out;

		}

		set_page_dirty(page);

		set_cold_data(page);

	} else {
@@ -766,7 +786,6 @@ static void move_data_page(struct inode *inode, block_t bidx, int gc_type, 
			.io_type = FS_GC_DATA_IO,

		};

		bool is_dirty = PageDirty(page);

		int err;



retry:

		set_page_dirty(page);
@@ -791,6 +810,7 @@ static void move_data_page(struct inode *inode, block_t bidx, int gc_type, 
	}

out:

	f2fs_put_page(page, 1);

	return err;

}



/*
@@ -800,7 +820,7 @@ static void move_data_page(struct inode *inode, block_t bidx, int gc_type, 
 * If the parent node is not valid or the data block address is different,

 * the victim data block is ignored.

 */

static void gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,

static int gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,

		struct gc_inode_list *gc_list, unsigned int segno, int gc_type)

{

	struct super_block *sb = sbi->sb;
@@ -808,6 +828,7 @@ static void gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum, 
	block_t start_addr;

	int off;

	int phase = 0;

	int submitted = 0;



	start_addr = START_BLOCK(sbi, segno);
@@ -824,7 +845,7 @@ static void gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum, 


		/* stop BG_GC if there is not enough free sections. */

		if (gc_type == BG_GC && has_not_enough_free_secs(sbi, 0, 0))

			return;

			return submitted;



		if (check_valid_map(sbi, segno, off) == 0)

			continue;
@@ -888,6 +909,7 @@ static void gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum, 
		if (inode) {

			struct f2fs_inode_info *fi = F2FS_I(inode);

			bool locked = false;

			int err;



			if (S_ISREG(inode->i_mode)) {

				if (!down_write_trylock(&fi->dio_rwsem[READ]))
@@ -906,11 +928,15 @@ static void gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum, 
			start_bidx = start_bidx_of_node(nofs, inode)

								+ ofs_in_node;

			if (f2fs_post_read_required(inode))

				move_data_block(inode, start_bidx, segno, off);

				err = move_data_block(inode, start_bidx, segno, off);

			else

				move_data_page(inode, start_bidx, gc_type,

				err = move_data_page(inode, start_bidx, gc_type,

								segno, off);



			if (!err && (gc_type == FG_GC ||

					f2fs_post_read_required(inode)))

				submitted++;



			if (locked) {

				up_write(&fi->dio_rwsem[WRITE]);

				up_write(&fi->dio_rwsem[READ]);
@@ -922,6 +948,8 @@ static void gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum, 


	if (++phase < 5)

		goto next_step;



	return submitted;

}



static int __get_victim(struct f2fs_sb_info *sbi, unsigned int *victim,
@@ -949,6 +977,7 @@ static int do_garbage_collect(struct f2fs_sb_info *sbi, 
	int seg_freed = 0;

	unsigned char type = IS_DATASEG(get_seg_entry(sbi, segno)->type) ?

						SUM_TYPE_DATA : SUM_TYPE_NODE;

	int submitted = 0;



	/* readahead multi ssa blocks those have contiguous address */

	if (sbi->segs_per_sec > 1)
@@ -992,10 +1021,11 @@ static int do_garbage_collect(struct f2fs_sb_info *sbi, 
		 *                                  - lock_page(sum_page)

		 */

		if (type == SUM_TYPE_NODE)

			gc_node_segment(sbi, sum->entries, segno, gc_type);

		else

			gc_data_segment(sbi, sum->entries, gc_list, segno,

			submitted += gc_node_segment(sbi, sum->entries, segno,

								gc_type);

		else

			submitted += gc_data_segment(sbi, sum->entries, gc_list,

							segno, gc_type);



		stat_inc_seg_count(sbi, type, gc_type);
@@ -1006,7 +1036,7 @@ static int do_garbage_collect(struct f2fs_sb_info *sbi, 
		f2fs_put_page(sum_page, 0);

	}



	if (gc_type == FG_GC)

	if (submitted)

		f2fs_submit_merged_write(sbi,

				(type == SUM_TYPE_NODE) ? NODE : DATA);

fs/f2fs/node.c

+10 −3
Original line number Diff line number Diff line
@@ -1446,8 +1446,10 @@ static int __write_node_page(struct page *page, bool atomic, bool *submitted, 
	return AOP_WRITEPAGE_ACTIVATE;

}



void move_node_page(struct page *node_page, int gc_type)

int move_node_page(struct page *node_page, int gc_type)

{

	int err = 0;



	if (gc_type == FG_GC) {

		struct writeback_control wbc = {

			.sync_mode = WB_SYNC_ALL,
@@ -1459,12 +1461,16 @@ void move_node_page(struct page *node_page, int gc_type) 
		f2fs_wait_on_page_writeback(node_page, NODE, true);



		f2fs_bug_on(F2FS_P_SB(node_page), PageWriteback(node_page));

		if (!clear_page_dirty_for_io(node_page))

		if (!clear_page_dirty_for_io(node_page)) {

			err = -EAGAIN;

			goto out_page;

		}



		if (__write_node_page(node_page, false, NULL,

					&wbc, false, FS_GC_NODE_IO))

					&wbc, false, FS_GC_NODE_IO)) {

			err = -EAGAIN;

			unlock_page(node_page);

		}

		goto release_page;

	} else {

		/* set page dirty and write it */
@@ -1475,6 +1481,7 @@ void move_node_page(struct page *node_page, int gc_type) 
	unlock_page(node_page);

release_page:

	f2fs_put_page(node_page, 0);

	return err;

}



static int f2fs_write_node_page(struct page *page,